#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

from __future__ import with_statement
import logging
import os
import re
import select
import signal
import subprocess
import sys
import tempfile
from datetime import datetime, timedelta

SCRIPT_DIR = os.path.abspath(os.path.realpath(os.path.dirname(sys.argv[0])))
sys.path.insert(0, SCRIPT_DIR)

# --------------------------------------------------------------
# TODO: this is a hack for mozbase without virtualenv, remove with bug 849900
# These paths refer to relative locations to test.zip, not the OBJDIR or SRCDIR
here = os.path.dirname(os.path.realpath(__file__))
mozbase = os.path.realpath(os.path.join(os.path.dirname(here), 'mozbase'))

if os.path.isdir(mozbase):
    for package in os.listdir(mozbase):
        package_path = os.path.join(mozbase, package)
        if package_path not in sys.path:
            sys.path.append(package_path)

import mozcrash
from mozscreenshot import printstatus, dump_screen


# ---------------------------------------------------------------

_DEFAULT_PREFERENCE_FILE = os.path.join(SCRIPT_DIR, 'prefs_general.js')
_DEFAULT_APPS_FILE = os.path.join(SCRIPT_DIR, 'webapps_mochitest.json')

_DEFAULT_WEB_SERVER = "127.0.0.1"
_DEFAULT_HTTP_PORT = 8888
_DEFAULT_SSL_PORT = 4443
_DEFAULT_WEBSOCKET_PORT = 9988

# from nsIPrincipal.idl
_APP_STATUS_NOT_INSTALLED = 0
_APP_STATUS_INSTALLED     = 1
_APP_STATUS_PRIVILEGED    = 2
_APP_STATUS_CERTIFIED     = 3

#expand _DIST_BIN = __XPC_BIN_PATH__
#expand _IS_WIN32 = len("__WIN32__") != 0
#expand _IS_MAC = __IS_MAC__ != 0
#expand _IS_LINUX = __IS_LINUX__ != 0
#ifdef IS_CYGWIN
#expand _IS_CYGWIN = __IS_CYGWIN__ == 1
#else
_IS_CYGWIN = False
#endif
#expand _BIN_SUFFIX = __BIN_SUFFIX__

#expand _DEFAULT_APP = "./" + __BROWSER_PATH__
#expand _CERTS_SRC_DIR = __CERTS_SRC_DIR__
#expand _IS_TEST_BUILD = __IS_TEST_BUILD__
#expand _IS_DEBUG_BUILD = __IS_DEBUG_BUILD__
#expand _CRASHREPORTER = __CRASHREPORTER__ == 1
#expand _IS_ASAN = __IS_ASAN__ == 1


if _IS_WIN32:
  import ctypes, ctypes.wintypes, time, msvcrt
else:
  import errno

def resetGlobalLog(log):
  while _log.handlers:
    _log.removeHandler(_log.handlers[0])
  handler = logging.StreamHandler(log)
  _log.setLevel(logging.INFO)
  _log.addHandler(handler)

# We use the logging system here primarily because it'll handle multiple
# threads, which is needed to process the output of the server and application
# processes simultaneously.
_log = logging.getLogger()
resetGlobalLog(sys.stdout)


#################
# PROFILE SETUP #
#################

class Automation(object):
  """
  Runs the browser from a script, and provides useful utilities
  for setting up the browser environment.
  """

  DIST_BIN = _DIST_BIN
  IS_WIN32 = _IS_WIN32
  IS_MAC = _IS_MAC
  IS_LINUX = _IS_LINUX
  IS_CYGWIN = _IS_CYGWIN
  BIN_SUFFIX = _BIN_SUFFIX

  UNIXISH = not IS_WIN32 and not IS_MAC

  DEFAULT_APP = _DEFAULT_APP
  CERTS_SRC_DIR = _CERTS_SRC_DIR
  IS_TEST_BUILD = _IS_TEST_BUILD
  IS_DEBUG_BUILD = _IS_DEBUG_BUILD
  CRASHREPORTER = _CRASHREPORTER
  IS_ASAN = _IS_ASAN

  # timeout, in seconds
  DEFAULT_TIMEOUT = 60.0
  DEFAULT_WEB_SERVER = _DEFAULT_WEB_SERVER
  DEFAULT_HTTP_PORT = _DEFAULT_HTTP_PORT
  DEFAULT_SSL_PORT = _DEFAULT_SSL_PORT
  DEFAULT_WEBSOCKET_PORT = _DEFAULT_WEBSOCKET_PORT

  def __init__(self):
    self.log = _log
    self.lastTestSeen = "automation.py"
    self.haveDumpedScreen = False

  def setServerInfo(self, 
                    webServer = _DEFAULT_WEB_SERVER, 
                    httpPort = _DEFAULT_HTTP_PORT, 
                    sslPort = _DEFAULT_SSL_PORT,
                    webSocketPort = _DEFAULT_WEBSOCKET_PORT):
    self.webServer = webServer
    self.httpPort = httpPort
    self.sslPort = sslPort
    self.webSocketPort = webSocketPort

  @property
  def __all__(self):
    return [
           "UNIXISH",
           "IS_WIN32",
           "IS_MAC",
           "log",
           "runApp",
           "Process",
           "DIST_BIN",
           "DEFAULT_APP",
           "CERTS_SRC_DIR",
           "environment",
           "IS_TEST_BUILD",
           "IS_DEBUG_BUILD",
           "DEFAULT_TIMEOUT",
          ]

  class Process(subprocess.Popen):
    """
    Represents our view of a subprocess.
    It adds a kill() method which allows it to be stopped explicitly.
    """

    def __init__(self,
                 args,
                 bufsize=0,
                 executable=None,
                 stdin=None,
                 stdout=None,
                 stderr=None,
                 preexec_fn=None,
                 close_fds=False,
                 shell=False,
                 cwd=None,
                 env=None,
                 universal_newlines=False,
                 startupinfo=None,
                 creationflags=0):
      _log.info("INFO | automation.py | Launching: %s", subprocess.list2cmdline(args))
      subprocess.Popen.__init__(self, args, bufsize, executable,
                                stdin, stdout, stderr,
                                preexec_fn, close_fds,
                                shell, cwd, env,
                                universal_newlines, startupinfo, creationflags)
      self.log = _log

    def kill(self):
      if Automation().IS_WIN32:
        import platform
        pid = "%i" % self.pid
        if platform.release() == "2000":
          # Windows 2000 needs 'kill.exe' from the 
          #'Windows 2000 Resource Kit tools'. (See bug 475455.)
          try:
            subprocess.Popen(["kill", "-f", pid]).wait()
          except:
            self.log.info("TEST-UNEXPECTED-FAIL | automation.py | Missing 'kill' utility to kill process with pid=%s. Kill it manually!", pid)
        else:
          # Windows XP and later.
          subprocess.Popen(["taskkill", "/F", "/PID", pid]).wait()
      else:
        os.kill(self.pid, signal.SIGKILL)

  def environment(self, env=None, xrePath=None, crashreporter=True, debugger=False, dmdPath=None, lsanPath=None):
    if xrePath == None:
      xrePath = self.DIST_BIN
    if env == None:
      env = dict(os.environ)

    ldLibraryPath = os.path.abspath(os.path.join(SCRIPT_DIR, xrePath))
    dmdLibrary = None
    preloadEnvVar = None
    if self.UNIXISH or self.IS_MAC:
      envVar = "LD_LIBRARY_PATH"
      preloadEnvVar = "LD_PRELOAD"
      if self.IS_MAC:
        envVar = "DYLD_LIBRARY_PATH"
        dmdLibrary = "libdmd.dylib"
      else: # unixish
        env['MOZILLA_FIVE_HOME'] = xrePath
        dmdLibrary = "libdmd.so"
      if envVar in env:
        ldLibraryPath = ldLibraryPath + ":" + env[envVar]
      env[envVar] = ldLibraryPath
    elif self.IS_WIN32:
      env["PATH"] = env["PATH"] + ";" + str(ldLibraryPath)
      dmdLibrary = "dmd.dll"
      preloadEnvVar = "MOZ_REPLACE_MALLOC_LIB"

    if dmdPath and dmdLibrary and preloadEnvVar:
      env[preloadEnvVar] = os.path.join(dmdPath, dmdLibrary)

    env['MOZ_CRASHREPORTER_DISABLE'] = '1'

    # Crash on non-local network connections by default.
    # MOZ_DISABLE_NONLOCAL_CONNECTIONS can be set to "0" to temporarily
    # enable non-local connections for the purposes of local testing.  Don't
    # override the user's choice here.  See bug 1049688.
    env.setdefault('MOZ_DISABLE_NONLOCAL_CONNECTIONS', '1')

    env['GNOME_DISABLE_CRASH_DIALOG'] = '1'
    env['XRE_NO_WINDOWS_CRASH_DIALOG'] = '1'

    # Set WebRTC logging in case it is not set yet
    env.setdefault('MOZ_LOG', 'signaling:3,mtransport:4,DataChannel:4,jsep:4,MediaPipelineFactory:4')
    env.setdefault('R_LOG_LEVEL', '6')
    env.setdefault('R_LOG_DESTINATION', 'stderr')
    env.setdefault('R_LOG_VERBOSE', '1')

    # ASan specific environment stuff
    if self.IS_ASAN and (self.IS_LINUX or self.IS_MAC):
      # Symbolizer support
      llvmsym = os.path.join(xrePath, "llvm-symbolizer")
      if os.path.isfile(llvmsym):
        env["ASAN_SYMBOLIZER_PATH"] = llvmsym
        self.log.info("INFO | automation.py | ASan using symbolizer at %s", llvmsym)
      else:
        self.log.info("TEST-UNEXPECTED-FAIL | automation.py | Failed to find ASan symbolizer at %s", llvmsym)

      try:
        totalMemory = int(os.popen("free").readlines()[1].split()[1])

        # Only 4 GB RAM or less available? Use custom ASan options to reduce
        # the amount of resources required to do the tests. Standard options 
        # will otherwise lead to OOM conditions on the current test slaves.
        if totalMemory <= 1024 * 1024 * 4:
          self.log.info("INFO | automation.py | ASan running in low-memory configuration")
          env["ASAN_OPTIONS"] = "quarantine_size=50331648:malloc_context_size=5"
        else:
          self.log.info("INFO | automation.py | ASan running in default memory configuration")
      except OSError,err:
        self.log.info("Failed determine available memory, disabling ASan low-memory configuration: %s", err.strerror)
      except:
        self.log.info("Failed determine available memory, disabling ASan low-memory configuration")

    return env

  def killPid(self, pid):
    try:
      os.kill(pid, getattr(signal, "SIGKILL", signal.SIGTERM))
    except WindowsError:
      self.log.info("Failed to kill process %d." % pid)

  if IS_WIN32:
    PeekNamedPipe = ctypes.windll.kernel32.PeekNamedPipe
    GetLastError = ctypes.windll.kernel32.GetLastError

    def readWithTimeout(self, f, timeout):
      """
      Try to read a line of output from the file object |f|. |f| must be a
      pipe, like the |stdout| member of a subprocess.Popen object created
      with stdout=PIPE. Returns a tuple (line, did_timeout), where |did_timeout|
      is True if the read timed out, and False otherwise. If no output is
      received within |timeout| seconds, returns a blank line.
      """

      if timeout is None:
        timeout = 0

      x = msvcrt.get_osfhandle(f.fileno())
      l = ctypes.c_long()
      done = time.time() + timeout

      buffer = ""
      while timeout == 0 or time.time() < done:
        if self.PeekNamedPipe(x, None, 0, None, ctypes.byref(l), None) == 0:
          err = self.GetLastError()
          if err == 38 or err == 109: # ERROR_HANDLE_EOF || ERROR_BROKEN_PIPE
            return ('', False)
          else:
            self.log.error("readWithTimeout got error: %d", err)
        # read a character at a time, checking for eol. Return once we get there.
        index = 0
        while index < l.value:
          char = f.read(1)
          buffer += char
          if char == '\n':
            return (buffer, False)
          index = index + 1
        time.sleep(0.01)
      return (buffer, True)

    def isPidAlive(self, pid):
      STILL_ACTIVE = 259
      PROCESS_QUERY_LIMITED_INFORMATION = 0x1000
      pHandle = ctypes.windll.kernel32.OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, 0, pid)
      if not pHandle:
        return False
      pExitCode = ctypes.wintypes.DWORD()
      ctypes.windll.kernel32.GetExitCodeProcess(pHandle, ctypes.byref(pExitCode))
      ctypes.windll.kernel32.CloseHandle(pHandle)
      return pExitCode.value == STILL_ACTIVE

  else:

    def readWithTimeout(self, f, timeout):
      """Try to read a line of output from the file object |f|. If no output
      is received within |timeout| seconds, return a blank line.
      Returns a tuple (line, did_timeout), where |did_timeout| is True
      if the read timed out, and False otherwise."""
      (r, w, e) = select.select([f], [], [], timeout)
      if len(r) == 0:
        return ('', True)
      return (f.readline(), False)

    def isPidAlive(self, pid):
      try:
        # kill(pid, 0) checks for a valid PID without actually sending a signal
        # The method throws OSError if the PID is invalid, which we catch below.
        os.kill(pid, 0)

        # Wait on it to see if it's a zombie. This can throw OSError.ECHILD if
        # the process terminates before we get to this point.
        wpid, wstatus = os.waitpid(pid, os.WNOHANG)
        return wpid == 0
      except OSError, err:
        # Catch the errors we might expect from os.kill/os.waitpid, 
        # and re-raise any others
        if err.errno == errno.ESRCH or err.errno == errno.ECHILD:
          return False
        raise

  def dumpScreen(self, utilityPath):
    if self.haveDumpedScreen:
      self.log.info("Not taking screenshot here: see the one that was previously logged")
      return

    self.haveDumpedScreen = True;
    dump_screen(utilityPath, self.log)


  def killAndGetStack(self, processPID, utilityPath, debuggerInfo):
    """Kill the process, preferrably in a way that gets us a stack trace.
       Also attempts to obtain a screenshot before killing the process."""
    if not debuggerInfo:
      self.dumpScreen(utilityPath)
    self.killAndGetStackNoScreenshot(processPID, utilityPath, debuggerInfo)

  def killAndGetStackNoScreenshot(self, processPID, utilityPath, debuggerInfo):
    """Kill the process, preferrably in a way that gets us a stack trace."""
    if self.CRASHREPORTER and not debuggerInfo:
      if not self.IS_WIN32:
        # ABRT will get picked up by Breakpad's signal handler
        os.kill(processPID, signal.SIGABRT)
        return
      else:
        # We should have a "crashinject" program in our utility path
        crashinject = os.path.normpath(os.path.join(utilityPath, "crashinject.exe"))
        if os.path.exists(crashinject):
          status = subprocess.Popen([crashinject, str(processPID)]).wait()
          printstatus("crashinject", status)
          if status == 0:
            return
    self.log.info("Can't trigger Breakpad, just killing process")
    self.killPid(processPID)

  def waitForFinish(self, proc, utilityPath, timeout, maxTime, startTime, debuggerInfo, symbolsPath, outputHandler=None):
    """ Look for timeout or crashes and return the status after the process terminates """
    stackFixerFunction = None
    didTimeout = False
    hitMaxTime = False
    if proc.stdout is None:
      self.log.info("TEST-INFO: Not logging stdout or stderr due to debugger connection")
    else:
      logsource = proc.stdout

      if self.IS_DEBUG_BUILD and symbolsPath and os.path.exists(symbolsPath):
        # Run each line through a function in fix_stack_using_bpsyms.py (uses breakpad symbol files)
        # This method is preferred for Tinderbox builds, since native symbols may have been stripped.
        sys.path.insert(0, utilityPath)
        import fix_stack_using_bpsyms as stackFixerModule
        stackFixerFunction = lambda line: stackFixerModule.fixSymbols(line, symbolsPath)
        del sys.path[0]
      elif self.IS_DEBUG_BUILD and self.IS_MAC:
        # Run each line through a function in fix_macosx_stack.py (uses atos)
        sys.path.insert(0, utilityPath)
        import fix_macosx_stack as stackFixerModule
        stackFixerFunction = lambda line: stackFixerModule.fixSymbols(line)
        del sys.path[0]
      elif self.IS_DEBUG_BUILD and self.IS_LINUX:
        # Run each line through a function in fix_linux_stack.py (uses addr2line)
        # This method is preferred for developer machines, so we don't have to run "make buildsymbols".
        sys.path.insert(0, utilityPath)
        import fix_linux_stack as stackFixerModule
        stackFixerFunction = lambda line: stackFixerModule.fixSymbols(line)
        del sys.path[0]

      # With metro browser runs this script launches the metro test harness which launches the browser.
      # The metro test harness hands back the real browser process id via log output which we need to
      # pick up on and parse out. This variable tracks the real browser process id if we find it.
      browserProcessId = -1

      (line, didTimeout) = self.readWithTimeout(logsource, timeout)
      while line != "" and not didTimeout:
        if stackFixerFunction:
          line = stackFixerFunction(line)

        if outputHandler is None:
            self.log.info(line.rstrip().decode("UTF-8", "ignore"))
        else:
            outputHandler(line)

        if "TEST-START" in line and "|" in line:
          self.lastTestSeen = line.split("|")[1].strip()
        if not debuggerInfo and "TEST-UNEXPECTED-FAIL" in line and "Test timed out" in line:
          self.dumpScreen(utilityPath)

        (line, didTimeout) = self.readWithTimeout(logsource, timeout)

        if not hitMaxTime and maxTime and datetime.now() - startTime > timedelta(seconds = maxTime):
          # Kill the application.
          hitMaxTime = True
          self.log.info("TEST-UNEXPECTED-FAIL | %s | application ran for longer than allowed maximum time of %d seconds", self.lastTestSeen, int(maxTime))
          self.log.error("Force-terminating active process(es).");
          self.killAndGetStack(proc.pid, utilityPath, debuggerInfo)
      if didTimeout:
        if line:
          self.log.info(line.rstrip().decode("UTF-8", "ignore"))
        self.log.info("TEST-UNEXPECTED-FAIL | %s | application timed out after %d seconds with no output", self.lastTestSeen, int(timeout))
        self.log.error("Force-terminating active process(es).");
        if browserProcessId == -1:
          browserProcessId = proc.pid
        self.killAndGetStack(browserProcessId, utilityPath, debuggerInfo)

    status = proc.wait()
    printstatus("Main app process", status)
    if status == 0:
      self.lastTestSeen = "Main app process exited normally"
    if status != 0 and not didTimeout and not hitMaxTime:
      self.log.info("TEST-UNEXPECTED-FAIL | %s | Exited with code %d during test run", self.lastTestSeen, status)
    return status

  def buildCommandLine(self, app, debuggerInfo, profileDir, testURL, extraArgs):
    """ build the application command line """

    cmd = os.path.abspath(app)
    if self.IS_MAC and os.path.exists(cmd + "-bin"):
      # Prefer 'app-bin' in case 'app' is a shell script.
      # We can remove this hack once bug 673899 etc are fixed.
      cmd += "-bin"

    args = []

    if debuggerInfo:
      args.extend(debuggerInfo.args)
      args.append(cmd)
      cmd = os.path.abspath(debuggerInfo.path)

    if self.IS_MAC:
      args.append("-foreground")

    if self.IS_CYGWIN:
      profileDirectory = commands.getoutput("cygpath -w \"" + profileDir + "/\"")
    else:
      profileDirectory = profileDir + "/"

    args.extend(("-no-remote", "-profile", profileDirectory))
    if testURL is not None:
      args.append((testURL))
    args.extend(extraArgs)
    return cmd, args

  def checkForZombies(self, processLog, utilityPath, debuggerInfo):
    """ Look for hung processes """
    if not os.path.exists(processLog):
      self.log.info('Automation Error: PID log not found: %s', processLog)
      # Whilst no hung process was found, the run should still display as a failure
      return True

    foundZombie = False
    self.log.info('INFO | zombiecheck | Reading PID log: %s', processLog)
    processList = []
    pidRE = re.compile(r'launched child process (\d+)$')
    processLogFD = open(processLog)
    for line in processLogFD:
      self.log.info(line.rstrip())
      m = pidRE.search(line)
      if m:
        processList.append(int(m.group(1)))
    processLogFD.close()

    for processPID in processList:
      self.log.info("INFO | zombiecheck | Checking for orphan process with PID: %d", processPID)
      if self.isPidAlive(processPID):
        foundZombie = True
        self.log.info("TEST-UNEXPECTED-FAIL | zombiecheck | child process %d still alive after shutdown", processPID)
        self.killAndGetStack(processPID, utilityPath, debuggerInfo)
    return foundZombie

  def checkForCrashes(self, minidumpDir, symbolsPath):
    return mozcrash.check_for_crashes(minidumpDir, symbolsPath, test_name=self.lastTestSeen)

  def runApp(self, testURL, env, app, profileDir, extraArgs, utilityPath = None,
             xrePath = None, certPath = None,
             debuggerInfo = None, symbolsPath = None,
             timeout = -1, maxTime = None, onLaunch = None,
             detectShutdownLeaks = False, screenshotOnFail=False, testPath=None, bisectChunk=None,
             valgrindPath=None, valgrindArgs=None, valgrindSuppFiles=None, outputHandler=None):
    """
    Run the app, log the duration it took to execute, return the status code.
    Kills the app if it runs for longer than |maxTime| seconds, or outputs nothing for |timeout| seconds.
    """

    if utilityPath == None:
      utilityPath = self.DIST_BIN
    if xrePath == None:
      xrePath = self.DIST_BIN
    if certPath == None:
      certPath = self.CERTS_SRC_DIR
    if timeout == -1:
      timeout = self.DEFAULT_TIMEOUT

    # copy env so we don't munge the caller's environment
    env = dict(env);
    env["NO_EM_RESTART"] = "1"
    tmpfd, processLog = tempfile.mkstemp(suffix='pidlog')
    os.close(tmpfd)
    env["MOZ_PROCESS_LOG"] = processLog


    cmd, args = self.buildCommandLine(app, debuggerInfo, profileDir, testURL, extraArgs)
    startTime = datetime.now()

    if debuggerInfo and debuggerInfo.interactive:
      # If an interactive debugger is attached, don't redirect output,
      # don't use timeouts, and don't capture ctrl-c.
      timeout = None
      maxTime = None
      outputPipe = None
      signal.signal(signal.SIGINT, lambda sigid, frame: None)
    else:
      outputPipe = subprocess.PIPE

    self.lastTestSeen = "automation.py"
    proc = self.Process([cmd] + args,
                 env = self.environment(env, xrePath = xrePath,
                                   crashreporter = not debuggerInfo),
                 stdout = outputPipe,
                 stderr = subprocess.STDOUT)
    self.log.info("INFO | automation.py | Application pid: %d", proc.pid)

    if onLaunch is not None:
      # Allow callers to specify an onLaunch callback to be fired after the
      # app is launched.
      onLaunch()

    status = self.waitForFinish(proc, utilityPath, timeout, maxTime, startTime, debuggerInfo, symbolsPath,
                                outputHandler=outputHandler)
    self.log.info("INFO | automation.py | Application ran for: %s", str(datetime.now() - startTime))

    # Do a final check for zombie child processes.
    zombieProcesses = self.checkForZombies(processLog, utilityPath, debuggerInfo)

    crashed = self.checkForCrashes(os.path.join(profileDir, "minidumps"), symbolsPath)

    if crashed or zombieProcesses:
      status = 1

    if os.path.exists(processLog):
      os.unlink(processLog)

    return status

  def elf_arm(self, filename):
    data = open(filename, 'rb').read(20)
    return data[:4] == "\x7fELF" and ord(data[18]) == 40 # EM_ARM

